Patch Antenna Cable Layout Around a Parasitic Element
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Solution Overview
Problem
Routing a power supply cable for a patch antenna attached to a vehicle's windshield or rear window is challenging, as it can affect antenna characteristics, especially when the cable extends inside the vehicle body.
Innovation Solution
A patch antenna design with a planar radiating element and parasitic elements where the cable connection direction is positioned away from the center of the parasitic element, minimizing the influence on antenna characteristics by maintaining a specific distance and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cable extends from the back surface side of the antenna for routing inside the vehicle body, then cable routing is achieved, but it becomes difficult to route the cable and affects antenna characteristics
Solution Approach 1:
The patent positions the cable connection point at a location spaced apart from the center of the parasitic element in the planar dimension, rather than connecting at the center. This spatial repositioning in the XY plane allows the cable to extend along the periphery of the radiating element, facilitating routing along the vehicle's A-pillar or B-pillar without passing through the antenna's central region, thus maintaining antenna characteristics while enabling practical cable installation
2Reliability
If the cable connection direction passes through the center of the parasitic element, then electrical connection is achieved, but antenna characteristics are adversely affected
Solution Approach 1:
The patent employs asymmetric positioning of the cable connection point relative to the parasitic element. Instead of symmetric central connection, the connection point is deliberately placed at an offset position along the periphery of the radiating element. This asymmetric configuration ensures the cable connection direction does not pass through the center of the parasitic element, reducing interference with the antenna's electromagnetic field distribution and current patterns while maintaining reliable electrical connection
Data Source
AI summary
A patch antenna comprising: a planar radiating element; a parasitic element provided at a position spaced apart from an end portion of the radiating element in a plan view when the radiating element is viewed from a direction perpendicular to a surface of the radiating element; and a cable electrically connected to the radiating element and configured to supply power to the radiating element, wherein an axis of the cable passing through a position where the cable is electrically connected to the radiating element is spaced apart from a center of the parasitic element.